[PATCH v3 1/8] dt-bindings: net: qcom: document the ethqos device for SCMI-based systems

[Krzysztof Kozlowski]

On Mon, Oct 27, 2025 at 04:44:49PM +0100, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski at linaro.org>
> 
> Describe the firmware-managed variant of the QCom DesignWare MAC. As the
> properties here differ a lot from the HLOS-managed variant, lets put it
> in a separate file.
> 
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski at linaro.org>
> ---
>  .../devicetree/bindings/net/qcom,ethqos-scmi.yaml  | 101 +++++++++++++++++++++
>  .../devicetree/bindings/net/snps,dwmac.yaml        |   5 +-
>  MAINTAINERS                                        |   1 +
>  3 files changed, 106 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/qcom,ethqos-scmi.yaml b/Documentation/devicetree/bindings/net/qcom,ethqos-scmi.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..b821299d7b30cdb802d9ee5d9fa17542b8334bd2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/qcom,ethqos-scmi.yaml
> @@ -0,0 +1,101 @@
> +# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/qcom,ethqos-scmi.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Ethernet ETHQOS device (firmware managed)
> +
> +maintainers:
> +  - Bjorn Andersson <andersson at kernel.org>
> +  - Konrad Dybcio <konradybcio at kernel.org>
> +  - Bartosz Golaszewski <bartosz.golaszewski at linaro.org>
> +
> +description:
> +  dwmmac based Qualcomm ethernet devices which support Gigabit
> +  ethernet (version v2.3.0 and onwards) with clocks, interconnects, etc.
> +  managed by firmware
> +
> +allOf:
> +  - $ref: snps,dwmac.yaml#
> +
> +properties:
> +  compatible:
> +    const: qcom,sa8255p-ethqos
> +
> +  reg:
> +    maxItems: 2
> +
> +  reg-names:
> +    items:
> +      - const: stmmaceth
> +      - const: rgmii
> +
> +  interrupts:
> +    items:
> +      - description: Combined signal for various interrupt events
> +      - description: The interrupt that occurs when HW safety error triggered
> +
> +  interrupt-names:
> +    items:
> +      - const: macirq
> +      - const: sfty
> +
> +  power-domains:
> +    minItems: 3

maxItems instead

But the other problem is that it is conflicting with snps,dwmac.yaml
which says max 1 is allowed. You need to fix that, along with
restricting other users of that shared schema to maxItems: 1.

> +
> +  power-domain-names:
> +    items:
> +      - const: core
> +      - const: mdio
> +      - const: serdes
> +
> +  iommus:
> +    maxItems: 1
> +
> +  dma-coherent: true
> +
> +  phys: true

Missing maxItems.

> +
> +  phy-names:
> +    const: serdes
> +
> +required:
> +  - compatible
> +  - reg-names
> +  - power-domains

power-domain-names

Shouldn't phys be required? How device can work sometimes without its
phy?


> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    ethernet: ethernet at 7a80000 {
> +        compatible = "qcom,sa8255p-ethqos";
> +        reg = <0x23040000 0x10000>,
> +              <0x23056000 0x100>;
> +        reg-names = "stmmaceth", "rgmii";
> +
> +        iommus = <&apps_smmu 0x120 0x7>;
> +
> +        interrupts = <GIC_SPI 946 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 782 IRQ_TYPE_LEVEL_HIGH>;
> +        interrupt-names = "macirq", "sfty";
> +
> +        dma-coherent;
> +
> +        snps,tso;
> +        snps,pbl = <32>;
> +        rx-fifo-depth = <16384>;
> +        tx-fifo-depth = <16384>;
> +
> +        phy-handle = <&ethernet_phy>;
> +        phy-mode = "2500base-x";

Incomplete example - missing phys.

> +
> +        snps,mtl-rx-config = <&mtl_rx_setup1>;
> +        snps,mtl-tx-config = <&mtl_tx_setup1>;
> +
> +        power-domains = <&scmi8_pd 0>, <&scmi8_pd 1>, <&scmi8_dvfs 0>;
> +        power-domain-names = "core", "mdio","serdes";
> +    };
> diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> index dd3c72e8363e70d101ed2702e2ea3235ee38e2a0..312d1bbc2ad1051520355039f5587381cbd1e01c 100644
> --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> @@ -71,6 +71,7 @@ properties:
>          - loongson,ls7a-dwmac
>          - nxp,s32g2-dwmac
>          - qcom,qcs404-ethqos
> +        - qcom,sa8255p-ethqos
>          - qcom,sa8775p-ethqos
>          - qcom,sc8280xp-ethqos
>          - qcom,sm8150-ethqos
> @@ -180,7 +181,8 @@ properties:
>            - const: ahb
>  
>    power-domains:
> -    maxItems: 1
> +    minItems: 1
> +    maxItems: 3

Ah, you did it. But you need to update all other bindings as well.

Best regards,
Krzysztof